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This patch is not meant to be merged, but rather to try and understand why this is needed and what a more suitable solution could be. Allowing BOs to be write-cached results in the following happening when trying to run any program on Tegra/GK20A: Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 ... (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) (nouveau_fence_done) from [<c02c3d00>] (ttm_bo_wait+0xec/0x168) (ttm_bo_wait) from [<c035e334>] (nouveau_ge...

...rather to try and understand >> why this is needed and what a more suitable solution could be. >> >> Allowing BOs to be write-cached results in the following happening when >> trying to run any program on Tegra/GK20A: >> >> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 >> ... >> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) >> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) >> (nouveau_fence_done) from [<c02c3d00>] (ttm_bo_wait+0xec/0x168) >> (ttm...

...is is needed and what a more suitable solution could be. >> >> >> >> Allowing BOs to be write-cached results in the following happening when >> >> trying to run any program on Tegra/GK20A: >> >> >> >> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 >> >> ... >> >> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) >> >> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) >> >> (nouveau_fence_done) from [<c02c3d00>] (t...

Hi, I''ve tried several different approaches to debootstrap a working rootfs for with a Cortex A15 model ( FastModels ) and Xen but still face some issues. Some information on my setup. For a Dom0 kernel I''m using the latest version from git://github.com/torvalds/linux.git, I attached my config as it might be of some use for others. I''m using the latest Xen unstable

...le solution could be. >>>>>> >>>>>> Allowing BOs to be write-cached results in the following happening when >>>>>> trying to run any program on Tegra/GK20A: >>>>>> >>>>>> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 >>>>>> ... >>>>>> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) >>>>>> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) >>>>>> (nouveau_fence_done...

...is test was done with > only one PCIe lane, so the perf increase may be even better with a more > adequate interconnect. Interestingly if I allow writecombined mappings in the kernel I get faults when attempting the read the mapped area: [ 78.074854] Unhandled fault: external abort on non-linefetch (0x1008) at 0xf003e010 ... [ 78.337862] [<c03491a8>] (nouveau_bo_rd32) from [<c0346374>] (nouveau_fence_update+0x5c/0x80) [ 78.352536] [<c0346374>] (nouveau_fence_update) from [<c03463b0>] (nouveau_fence_done+0x18/0x28) [ 78.367531] [<c03463b0>] (nouveau_fence_do...

...eant to be merged, but rather to try and understand > why this is needed and what a more suitable solution could be. > > Allowing BOs to be write-cached results in the following happening when > trying to run any program on Tegra/GK20A: > > Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 > ... > (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) > (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) > (nouveau_fence_done) from [<c02c3d00>] (ttm_bo_wait+0xec/0x168) > (ttm_bo_wait) from [<...

...> >> why this is needed and what a more suitable solution could be. > >> > >> Allowing BOs to be write-cached results in the following happening when > >> trying to run any program on Tegra/GK20A: > >> > >> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 > >> ... > >> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) > >> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) > >> (nouveau_fence_done) from [<c02c3d00>] (ttm_bo_wait+0xec/...

...ore suitable solution could be. > >> >> > >> >> Allowing BOs to be write-cached results in the following happening when > >> >> trying to run any program on Tegra/GK20A: > >> >> > >> >> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 > >> >> ... > >> >> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) > >> >> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) > >> >> (nouveau_fence_done) from [...

...a with pgprot set to writecombined. I don't know exactly why this is causing havoc, but having two conflicting virtual mappings of the same physical memory is documented to at least produce undefined behavior on ARMv7. Regards, Lucas > [ 78.074854] Unhandled fault: external abort on non-linefetch > (0x1008) at 0xf003e010 > ... > [ 78.337862] [<c03491a8>] (nouveau_bo_rd32) from [<c0346374>] > (nouveau_fence_update+0x5c/0x80) > [ 78.352536] [<c0346374>] (nouveau_fence_update) from [<c03463b0>] > (nouveau_fence_done+0x18/0x28) > [ 78.367531] [...

...; >>>>>> > >>>>>> Allowing BOs to be write-cached results in the following happening when > >>>>>> trying to run any program on Tegra/GK20A: > >>>>>> > >>>>>> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 > >>>>>> ... > >>>>>> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) > >>>>>> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) > >>>>>>...

...t;>>> >>>>>>>> Allowing BOs to be write-cached results in the following happening when >>>>>>>> trying to run any program on Tegra/GK20A: >>>>>>>> >>>>>>>> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0036010 >>>>>>>> ... >>>>>>>> (nouveau_bo_rd32) from [<c0357d00>] (nouveau_fence_update+0x5c/0x80) >>>>>>>> (nouveau_fence_update) from [<c0357d40>] (nouveau_fence_done+0x1c/0x38) >>>>>...

Hi everyone, Here is the second batch of patches to add GK20A support to Nouveau. This time we are adding the actual chip support, and this series brings the driver to a point where a slightly-tweaked Mesa successfully runs shaders and renders triangles on GBM! Many thanks to Thierry Reding and the people on the #nouveau IRC channel for their help without which we would not have reached this